Page 308 - 2018_IRC

WALL CONSTRUCTION

R608.5.4.2 Location of reinforcement in walls. For located in the middle third of the span between lateral sup-
location of reinforcement in foundation walls and ports, or located and constructed as required for joints in
above-grade walls, see Sections R404.1.3.3.7.2 and plain concrete walls.
R608.6.5, respectively. Exception: Vertical wall reinforcement required by
R608.5.4.3 Lap splices. Vertical and horizontal wall this code is permitted to be used in lieu of construction
reinforcement required by Sections R608.6 and R608.7 joint reinforcement, provided the spacing does not
shall be the longest lengths practical. Where splices are exceed 24 inches (610 mm), or the combination of wall
necessary in reinforcement, the length of lap splices reinforcement and No. 4 bars described in Section
shall be in accordance with Table R608.5.4(1) and Fig- R608.5.5 does not exceed 24 inches (610 mm).
ure R608.5.4(1). The maximum gap between noncon- R608.6 Above-grade wall requirements.
tact parallel bars at a lap splice shall not exceed the
smaller of one-fifth the required lap length and 6 inches R608.6.1 General. The minimum thickness of load-bear-
(152 mm). See Figure R608.5.4(1). ing and nonload-bearing above-grade walls and reinforce-
ment shall be as set forth in the appropriate table in this
R608.5.4.4 Development of bars in tension. Where section based on the type of wall form to be used. The wall
bars are required to be developed in tension by other shall be designed in accordance with ACI 318 where the
provisions of this code, development lengths and cover wall or building is not within the limitations of Section
for hooks and bar extensions shall comply with Table R608.2, where design is required by the tables in this sec-
R608.5.4(1) and Figure R608.5.4(2). The development tion or where the wall is not within the scope of the tables
lengths shown in Table R608.5.4(1) shall apply to bun- in this section.
dled bars in lintels installed in accordance with Section
R608.8.2.2. Above-grade concrete walls shall be constructed in
accordance with this section and Figure R608.6(1),
R608.5.4.5 Standard hooks. Where reinforcement is R608.6(2), R608.6(3) or R608.6(4). Above-grade concrete
required by this code to terminate with a standard hook, walls that are continuous with stem walls and not laterally
the hook shall comply with Figure R608.5.4(3). supported by the slab-on-ground shall be designed and
R608.5.4.6 Webs of waffle-grid walls. Reinforcement, constructed in accordance with this section. Concrete
including stirrups, shall not be placed in webs of waf- walls shall be supported on continuous foundation walls or
fle-grid walls, including lintels. Webs are permitted to slabs-on-ground that are monolithic with the footing in
have form ties. accordance with Section R403. The minimum length of
solid wall without openings shall be in accordance with
R608.5.4.7 Alternate grade of reinforcement and
spacing. Where tables in Sections R404.1.3 and Section R608.7. Reinforcement around openings, includ-
R608.6 specify vertical wall reinforcement based on ing lintels, shall be in accordance with Section R608.8.
minimum bar size and maximum spacing, which are Lateral support for above-grade walls in the out-of-plane
based on Grade 60 (420 MPa) steel reinforcement, dif- direction shall be provided by connections to the floor
ferent size bars or bars made from a different grade of framing system, if applicable, and to ceiling and roof
steel are permitted provided an equivalent area of steel framing systems in accordance with Section R608.9. The
per linear foot of wall is provided. Use of Table wall thickness shall be equal to or greater than the thick-
R608.5.4(2) is permitted to determine the maximum ness of the wall in the story above.
bar spacing for different bar sizes than specified in the R608.6.2 Wall reinforcement for wind. Vertical wall
tables and bars made from a different grade of steel. reinforcement for resistance to out-of-plane wind forces
Bars shall not be spaced less than one-half the wall shall be determined from Table R608.6(1), R608.6(2),
thickness, or more than 48 inches (1219 mm) on center. R608.6(3) or R608.6(4). For the design of nonload-bear-
R608.5.5 Construction joints in walls. Construction ing walls, in Tables R608.6(1), R608.6(2) and R608.6(3)
joints shall be made and located to not impair the strength use the appropriate column labeled “Top.” (see Sections
of the wall. Construction joints in plain concrete walls, R608.7.2.2.2 and R608.7.2.2.3). There shall be a vertical
including walls required to have not less than No. 4 bars at bar at corners of exterior walls. Unless more horizontal
48 inches (1219 mm) on center by Section R608.6, shall reinforcement is required by Section R608.7.2.2.1, the
be located at points of lateral support, and not less than minimum horizontal reinforcement shall be four No. 4
one No. 4 bar shall extend across the construction joint at a bars [Grade 40 (280 MPa)] placed as follows: top bar
spacing not to exceed 24 inches (610 mm) on center. Con- within 12 inches (305 mm) of the top of the wall, bottom
struction joint reinforcement shall have not less than 12 bar within 12 inches (305 mm) of the finish floor and one
inches (305 mm) of embedment on both sides of the joint. bar each at approximately one-third and two-thirds of the
Construction joints in reinforced concrete walls shall be wall height.

2018 INTERNATIONAL RESIDENTIAL CODE ® 283
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